A formworkless cast-in-place STC steel-concrete composite bridge deck composite construction structure

Abstract

This utility model relates to a formworkless cast-in-place STC steel-concrete composite bridge deck construction structure, including a side structure along the bridge length and an end structure along the bridge width. STC concrete is cast-in-place within the space enclosed by the end and side structures. The side structure includes a steel sheet, a filler layer, and sealant. The steel sheet is vertically welded to the top plate of the steel box girder. The filler layer is placed between the steel sheet and the perforated steel reinforcement of the bridge deck crash barrier on the outside of the steel sheet. Sealant is applied to the joint between the steel sheet and the top plate of the steel box girder. The end structure includes, from bottom to top, a leak-proof non-woven geotextile, an end baffle, and wooden joists placed on the top plate of the steel box girder, and also includes wire binding the end baffle and wooden joists together. This utility model enables rapid construction and ensures control over the end and side alignment and construction quality of the cast-in-place STC steel-concrete composite bridge deck, belonging to the field of bridge construction technology.

Description

Technical Field

[0001] This utility model relates to bridge construction technology, specifically to a formwork-free cast-in-place STC steel-concrete composite bridge deck composite construction structure. Background Technology

[0002] In bridge structures, the bridge deck is the load-bearing structure that directly bears the wheel pressure of vehicles, and it is directly related to structural safety and driving comfort. Therefore, it needs sufficient strength and stiffness. Traditional orthotropic steel bridge decks are expensive, have low stiffness, are prone to fatigue cracking, and are easily damaged. They have many defects, and the cost of later maintenance and reinforcement is high, and their service life is not long.

[0003] Currently, in response to the pain points and difficulties of steel bridge deck paving such as fatigue cracking and easy damage, ultra-high toughness concrete (STC) is used, and its construction quality determines the quality life cycle after the bridge is opened to traffic.

[0004] When pouring STC concrete, the side structure is usually made by fully welding thin steel plates onto the top plate of the steel beam. The disadvantages are: 1. The amount of welding work is large; 2. The construction progress is slow; 3. There will be ultra-high toughness concrete residue between the perforated plate of the outer bridge deck anti-collision guardrail and the thin steel plate, the working area is narrow and the cleaning is difficult.

[0005] When pouring STC concrete, the end structure typically uses molded polystyrene (EPS) boards as baffles. This material is relatively lightweight and prone to displacement, shifting, and brittle fracture under external forces, making it difficult to control the end shape of the STC concrete. Furthermore, after removal, it easily adheres to the top slab of the steel beam, making cleaning difficult. In addition, EPS boards absorb almost no water, and the seeping cement slurry can easily cause environmental pollution.

[0006] Therefore, it is necessary to optimize the STC concrete pouring construction structure. Utility Model Content

[0007] In view of the technical problems existing in the prior art, the purpose of this utility model is to provide a formwork-free cast-in-place STC steel-concrete composite bridge deck assembly construction structure, which can achieve rapid construction and ensure the end and side alignment and construction quality control of the cast-in-place STC steel-concrete composite bridge deck.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A formworkless cast-in-place STC steel-concrete composite bridge deck construction structure includes a side structure along the bridge length and an end structure along the bridge width. STC concrete is cast-in-place within the space enclosed by the end structure and the side structure. The side structure includes a steel sheet, a filler layer, and sealant. The steel sheet is vertically welded to the top plate of the steel box girder. The filler layer is placed between the steel sheet and the perforated plate of the bridge deck anti-collision guardrail on the outside of the steel sheet. The sealant is applied to the joint between the steel sheet and the top plate of the steel box girder. The end structure includes, from bottom to top, a non-woven geotextile, an end baffle, and a wooden joist placed on the top plate of the steel box girder, and also includes wires binding the end baffle and the wooden joist together.

[0010] As a preferred option, the steel sheet is connected to the top plate of the steel box girder by spot welding, with spot welding every 0.8-1.2m; multiple steel sheets are set along the length of the bridge, and adjacent steel sheets are connected by lap welding.

[0011] As a preferred option, multiple filling layers are provided along the length of the bridge, and the filling layers are made of pearl cotton foam boards. The pearl cotton foam boards are made of shaped foamed polyethylene material.

[0012] As a preferred option, the sealant is a neutral silicone weather-resistant sealant.

[0013] As a preferred embodiment, the seepage-proof nonwoven geotextile extends from the outer end of the end baffle along the length of the bridge; and extends from both ends of the end baffle along the width of the bridge.

[0014] As a preferred option, the end baffles are made of pearl cotton foam board; the end baffles and the wooden joists are bonded together with double-sided adhesive. The pearl cotton foam board is made of shaped foamed polyethylene material.

[0015] As a preferred embodiment, the bridge deck reinforcement includes transverse and longitudinal reinforcement, which is fixed to the top plate of the steel box girder by studs; the end baffles and wooden joists are tied to the transverse reinforcement by wire.

[0016] As a preferred embodiment, the steel sheet is 3mm thick, 6m long, and 5cm high; the filling layer is 6cm wide and 6cm thick; the end baffle is 6cm wide and 3cm thick; the wooden joists are 6cm wide and 2cm thick; and the waterproof nonwoven geotextile weighs 350g / m².

[0017] This utility model has the following advantages:

[0018] 1. The side structure adopts a combination of spot welding of thin steel plates and sealing with sealant, which reduces the amount of welding work of thin steel plates and ensures the lateral stiffness and sealing performance of thin steel plates.

[0019] 2. Thin steel plates can be embedded in the bridge deck, increasing the lateral stiffness at the base of the crash barrier. After the bridge deck is poured, the filler layer needs to be removed, and the gap is used to pour the concrete at the base of the crash barrier.

[0020] 3. A filling layer, preferably made of pearl cotton foam board, is placed between the perforated plate of the bridge deck crash barrier steel bars and the thin steel plate to prevent STC concrete from entering the gap and reduce the amount of cleaning work for STC concrete residue.

[0021] 4. The end structure adopts an end baffle, wooden beams, and wire binding, preferably a combination of binding to the transverse steel bars on the bridge deck, which ensures the lateral stiffness of the end structure and prevents deformation and displacement. Furthermore, it meets the deformation requirements when the STC leveling machine travels on it.

[0022] 5. The leak-proof non-woven geotextile extends outwards to ensure it can absorb any overflowing cement slurry and prevent environmental pollution.

[0023] 6. The steel sheet adopts spot welding and a multi-segment design, which makes it easier to control the side profile. The steel sheet is fully welded together to ensure that the rigidity meets the requirements.

[0024] 7. Neutral silicone weather-resistant sealant features excellent sealing performance, strong adhesion, and is environmentally friendly and odorless.

[0025] 8. Shaped foamed polyethylene (EPE) material has good water resistance, plasticity, and toughness. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the combined construction structure at the edge crash barrier.

[0027] Figure 2 This is a structural diagram of the combined construction structure at the central crash barrier.

[0028] Figure 3 It is a plan layout of the combined construction structure.

[0029] In the diagram, 1-steel box girder, 2-timber joists, 3-end baffles, 4-perforated steel reinforcement plate for side crash barriers, 5-side crash barriers, 6-steel sheet, 7-filling layer, 8-perforated steel reinforcement plate for center crash barriers, 9-center crash barriers, 10-leak-proof non-woven geotextile, 11-studs, 12-transverse reinforcement, 13-longitudinal reinforcement. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments.

[0031] Example

[0032] This embodiment is a monolithic bridge, in which a section of bridge deck pavement is poured along the length of the bridge. For example... Figure 3 As shown, a bridge deck is poured between the central guardrail and the side guardrail. Side structures are set on the inner side of both the central guardrail and the side guardrail. End structures are set at both the front and rear ends of the bridge deck to be poured. Reinforcing bars are arranged at the location of the bridge deck to be poured. STC concrete is poured in the space enclosed by the side structures and the end structures.

[0033] A formworkless cast-in-place STC steel-concrete composite bridge deck construction structure includes a side structure along the bridge length and an end structure along the bridge width. STC concrete is cast-in-place within the space enclosed by the end structure and the side structure. The side structure includes a steel sheet, a filler layer, and sealant. The steel sheet is vertically welded to the top plate of the steel box girder. The filler layer is placed between the steel sheet and the perforated plate of the bridge deck anti-collision guardrail on the outside of the steel sheet. The sealant is applied to the joint between the steel sheet and the top plate of the steel box girder. The end structure includes, from bottom to top, a non-woven geotextile, an end baffle, and a wooden joist placed on the top plate of the steel box girder, and also includes wires binding the end baffle and the wooden joist together.

[0034] The steel sheet is connected to the top plate of the steel box girder by spot welding, with spot welding every 0.8-1.2m. Multiple steel sheets are installed along the length of the bridge, and adjacent steel sheets are connected by lap welding. In this embodiment, spot welding is performed every 1m.

[0035] Multiple filling layers, made of pearl cotton foam board, are installed along the length of the bridge. The pearl cotton foam board is made of shaped expanded polyethylene material. The filling layers are manually filled and removed, making the operation convenient.

[0036] The sealant is a neutral silicone weather-resistant sealant. After the weld has cooled and passed visual inspection, the neutral silicone weather-resistant sealant is evenly applied to the junction of the steel sheet and the top plate of the steel box girder to prevent grout leakage.

[0037] Along the length of the bridge, the non-woven geotextile extends from the outer end of the end baffle; along the width of the bridge, the non-woven geotextile extends from both ends of the end baffle. Preferably, the extension length in the length direction is 40cm, and the extension length on each side in the width direction is 5cm, to ensure that it can absorb the leaked cement grout.

[0038] The end baffles are made of pearl cotton foam board; the end baffles and wooden joists are bonded together with double-sided adhesive. The pearl cotton foam board is made of shaped expanded polyethylene material.

[0039] The bridge deck reinforcement includes transverse and longitudinal reinforcement, which is fixed to the top plate of the steel box girder by studs; the end baffles and wooden joists are tied to the transverse reinforcement by wire.

[0040] The steel sheet is 3mm thick, 6m long, and 5cm high; the filling layer is 6cm wide and 6cm thick; the end baffle is 6cm wide and 3cm thick; the wooden joists are 6cm wide and 2cm thick; the waterproof non-woven geotextile weighs 350g / m². 20# iron wire with a diameter of 0.9mm is used. The steel sheet is 5cm away from the perforated steel plate.

[0041] The steel sheet, filling layer, anti-seepage non-woven geotextile, end baffle and wooden joists of this utility model all adopt a multi-segment splicing structure, and it is necessary to ensure the tightness of the splicing parts to prevent grout leakage.

[0042] The construction process is as follows:

[0043] 1) High-pressure water washing removes dust and debris from the top plate of the steel box girder.

[0044] 2) The thin steel plates are spot-welded to the top plate of the steel box girder along the length of the bridge.

[0045] 3) After the weld has cooled and passed the visual inspection, apply neutral silicone weather-resistant sealant evenly at the junction of the steel sheet and the top plate of the steel box girder.

[0046] 4) Fill the space between the perforated steel plate and the thin steel plate of the bridge deck crash barrier with pearl cotton foam board to ensure that the filling is full and dense.

[0047] 5) Attach the pearl cotton foam board to the wooden frame with double-sided tape, and securely tie it to the transverse steel bars of the bridge deck pavement with No. 20 iron wire.

[0048] 6) After the seepage-proof non-woven geotextile is folded in half, it is pressed tightly underneath by the end structure, which is 40cm longer than the end structure and 5cm wider than the side structure, to absorb the seepage cement slurry.

[0049] 7) Use a boom pump to pump STC concrete into the designated placing device to achieve concrete spreading.

[0050] 8) Use a tire-type STC leveling machine to lift and level the slurry, supplemented by manual smoothing and finishing.

[0051] 9) Cover with a moisturizing film for 1 day.

[0052] 10) Remove the filling layer and end structure.

[0053] 11) Steam curing for 2 days.

[0054] Thus, the construction of one section of the bridge deck was completed.

[0055] Comparative Example

[0056] The comparative example uses a cast-in-place STC steel-concrete composite bridge deck strip concrete formwork structure, including side strip structures and end strip structures; both side and end strip structures are 20cm wide and have the same thickness as the STC cast-in-place concrete layer, and are constructed according to the following steps:

[0057] Step 1: Binding of steel reinforcement in STC bridge deck pavement layer.

[0058] Step 2: Install the side and end strip structure templates.

[0059] Step 3: Clean the bridge surface of dust and debris.

[0060] Step 4: Pour 20cm wide STC concrete for the side and end strip structures and level and finish the surface.

[0061] Step 5: Sprinkle water and cover with a moisturizing film for at least 7 days for maintenance.

[0062] Step 6: Pour STC concrete within the frame enclosed by the STC strip concrete formwork structure.

[0063] Step 7: The tire-mounted STC screed travels on the side strip structure to perform slurry lifting and leveling.

[0064] Step 8: Sprinkle water and cover with a moisturizing film for 1 day for maintenance.

[0065] Step 9: Steam curing for 2 days.

[0066] Step 10: The construction of the finished STC concrete is completed.

[0067] The construction efficiency was measured using examples and comparative models, and the recorded data is shown in Table 1:

[0068] Table 1. Actual Efficiency Measurement Records of Examples and Comparative Examples

[0069]

[0070] As can be seen from Table 1, the embodiment takes a total of 17 days to complete, while the comparative example takes a total of 25 days. The embodiment improves efficiency by 32% because it has one less STC strip concrete pouring and moisturizing curing process than the comparative example, and the construction efficiency is greatly improved.

[0071] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A formworkless cast-in-place STC steel-concrete composite bridge deck construction structure, comprising side structures arranged along the length of the bridge and end structures arranged along the width of the bridge, wherein STC concrete is cast-in-place within the space enclosed by the end structures and the side structures, characterized in that, The side structure includes a steel sheet, a filling layer, and sealant. The steel sheet is welded vertically to the top plate of the steel box girder. The filling layer is placed between the steel sheet and the perforated plate of the bridge deck anti-collision guardrail on the outside of the steel sheet. The sealant is applied to the joint between the steel sheet and the top plate of the steel box girder. The end structure includes, from bottom to top, a non-woven geotextile, an end baffle, and a wooden joist placed on the top plate of the steel box girder. It also includes wires that bind the end baffle and the wooden joist together.

2. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: The steel sheet is connected to the top plate of the steel box girder by spot welding, with spot welding every 0.8-1.2m; multiple steel sheets are set along the length of the bridge, and adjacent steel sheets are connected by lap welding.

3. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: Multiple filling layers are installed along the length of the bridge, and the filling layers are made of pearl cotton foam boards.

4. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: The sealant is a neutral silicone weather-resistant sealant.

5. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: Along the length of the bridge, the waterproof nonwoven geotextile extends from the outer end of the end baffle; along the width of the bridge, the waterproof nonwoven geotextile extends from both ends of the end baffle.

6. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: The end baffles are made of pearl cotton foam board; the end baffles and the wooden joists are bonded together with double-sided adhesive.

7. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 3, characterized in that: Pearl cotton foam boards are made of shaped foamed polyethylene material.

8. A formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 6, characterized in that: Pearl cotton foam boards are made of shaped foamed polyethylene material.

9. The formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: The bridge deck reinforcement includes transverse and longitudinal reinforcement, which is fixed to the top plate of the steel box girder by studs; the end baffles and wooden joists are tied to the transverse reinforcement by wire.

10. A formworkless cast-in-place STC steel-concrete composite bridge deck construction structure according to claim 1, characterized in that: The steel sheet is 3mm thick, 6m long, and 5cm high; the filling layer is 6cm wide and 6cm thick; the end baffle is 6cm wide and 3cm thick; the wooden joists are 6cm wide and 2cm thick; and the waterproof nonwoven geotextile weighs 350g / m².

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